Add method to copy node

src/main/java/com/saicone/settings/SettingsNode.java

@@ -2,6 +2,7 @@
 
 import com.saicone.settings.node.ListNode;
 import com.saicone.settings.node.MapNode;
+import com.saicone.settings.node.NodeKey;
 import com.saicone.settings.node.ObjectNode;
 import com.saicone.settings.type.ValueType;
 import com.saicone.settings.util.Strings;
@@ -461,6 +462,39 @@ default SettingsNode move(@NotNull String... path) {
         return this;
     }
 
+    /**
+     * Copy this node into new one and return the clone itself.
+     *
+     * @return       a clone of this node.
+     */
+    @NotNull
+    default SettingsNode copy() {
+        return copy(false);
+    }
+
+    /**
+     * Copy this node into new one and return the clone itself.
+     *
+     * @param parent true to save parent information.
+     * @return       a clone of this node.
+     */
+    @NotNull
+    default SettingsNode copy(boolean parent) {
+        return copy(parent, true);
+    }
+
+    /**
+     * Copy this node into new one and return the clone itself.
+     *
+     * @param parent true to save parent information.
+     * @param key    true to save key information.
+     * @return       a clone of this node.
+     */
+    @NotNull
+    default SettingsNode copy(boolean parent, boolean key) {
+        return NodeKey.of(parent ? getParent() : null, key ? getKey() : null, this);
+    }
+
     /**
      * Cast this node into an object node type.
      *